Youssef Aallaa

Youssef Aallaa (died 17 August 2017) was a Moroccan Islamic State sympathizer and one of the planners of the 2017 Barcelona attack.

Biography
Youssef Aallaa was from Naour, Morocco, and he was the brother of Said Aallaa. The brothers lived in Ripoll, Spain, and they became involved with a cell of Islamic State sympathizers in the Catalonia region. Youssef and Abdelbaki Es Satty planned to blow up the Sagrada Familia church with 120 butane and propane canisters and TATP, but their stockpiled explosives accidentally detonated in their apartment, kiling the two of them.